人由平卧位突然站立时,常出现静脉回心血量减少,每搏输出量减少。
心脏每搏输出量的变化主要影响
A.脉压
B.舒张压
C.平均动脉压
D.收缩压
E.中心静脉压
参考答案:D
句型转换。
1. They need two bananas when they make fruit salad. (对画线部分提问)
bananas do they need when they make fruit salad?
2. There is some water in the glass. (对画线部分提问)
water is there in the glass?
3. Let's make fruit salad. (改为反意疑问句)
Let's make fruit salad, ?
4. Turn on the blender. (改为否定句)
the blender.
5. Why don't you cut up the pears? (改为同义句)
cut up the pears?
辐射的遗传效应是显现在()身上的效应。
A.受照人自己
B.受照人家人
C.没任何人
D.受照人后代